get specific intent using events in Dialogflow Essentials

Trying to get specific intent using events in Dialogflow Essentials

below is the request

   {
    "queryInput": {
        "event": {
            "name": "start",
            "languageCode": "en"
        }
    }
}

response:

{
"responseId": "4f2e-8de0-e5ae7ef17a60-32d6a6f2",
"queryResult": {
    "action": "input.unknown",
    "parameters": {},
    "allRequiredParamsPresent": true
}
    

Same working when using text. Would like to make it work using event as well

{
    "queryInput": {
        "text": {
            "text": "start",
            "languageCode": "en"
        }
    }
}

response:

{
    "responseId": "4e9b-b131-f5598b8d7f11-32d6a6f2",
    "queryResult": {
        "queryText": "start",
        "parameters": {},
        "allRequiredParamsPresent": true
}